1. Summary of significant accounting policies (Details 1) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summary Of Significant Accounting Policies
Basic EPS, Income	$ 1,962	$ 1,743
Effect of Dilutive Securities Convertible Preferred Stock, Income	128	128
Diluted EPS, Income	$ 2,090	$ 1,871
Diluted EPS, Shares	3,285,373	3,292,646
Effect of Dilutive Securities Convertible Preferred Stock, Shares	(444,400)	(444,400)
Diluted EPS, Shares	3,729,674	3,737,046
Basic EPS, Per Shares	$ 0.60	$ 0.53
Effect of Dilutive Securities Convertible Preferred Stock, Per Shares	(0.03)	(0.03)
Diluted EPS, Per Shares	$ 0.56	$ 0.50